Metallic blast material



Patented Jan. 31, 1939 PATENT OFFICE 2,145,150 7 nmramc nus-r mum.

John F. Ervin, Ann nun.

No Drawing. Appllcation'soptember 11, 1936,

Serial No. 100,388

3 Claims. (01. si-aso) The invention relates to such metal abrasive materials as are used in the blast cleaning of iron, other castings, steel, stone, enamel-ware or other objects where the blast material is thrown by air or steam pressure or by mechanical vforce against them or used as an abrasive medium for sawing, cutting or polishing stone or other materials. Such metal abrasives are prin-' cipally iron containing over 1% in carbon and.

.00% to 5.% chromium and up to 5.% nickel and up to 3.5% molybdenum and up to .5% vanadium.

Metal abrasives are now produced, that are principally iron with an approximate analysis of carbon 2.50%; manganese .50%; silicon 1.5%;

sulphur .l0%; phosphorus 30% balance mostly iron.

The life of an abrasive used in blasting is due to the resistance to breaking down under impact due to the high velocity of the abrasive when it strikes the object to be cleaned. The life is also governed by the resistance to-wear or abrasion.

' The power of resistance to failure by impact of a blast material is increased to a great extent by the addition of vanadium and chromium in the ratio of approximately .1 to 50, i. e. 1 part of vanadium to 50 parts otchromium.

The power of resistance to failure by crushing of a blast material to a definite degree of fineness is greatly increased by the addition of 30. molybdenum and nickel in the ratio oil to 5; i. e.

one part of molybdenum to 5 parts of nickel.

' I claim:

1. An abrasive material comprising discrete particles of an alloy which is characterized by a 35 high-impact and abrasion resistance, such particles consisting of effective amounts and up to 5% of chromium; effective amounts and up to 5% of nickel; effective amounts and up to 1.0% of molybdenum; effective amounts and up to .l% 0 of vanadium; substantially 1% of carbon, the

remainder of the alloy consisting of iron with small amounts of impurities, such as manganese, silicon and phosphorus, in insuilicient quantity to alter the characteristics of the alloy; the alloy being further characterized in that the 5 vanadium content is adjusted to substantially one-fiftieth of the chromium content.

2. An abrasive material comprising discrete particles of an alloy which is characterized by a high impact and abrasion resistance, such par- 10 ticles consisting of effective amounts and up to 5% of chromium; eflective amounts and up to 5% of nickel; effective amounts and up to 1.0% of molybdenum; effective amounts and up to .l% of vanadium; substantially 1% of carbon, the i5 remainder of the alloy consisting of iron with small amounts of impurities, such as manganese, silicon and phosphorus, in insuflicient quantity to alter the characteristics of the alloy; the alloy being further characterized in that the 20 molybdenum content is adjusted to substantially one-fifth of the nickel-content. J I

3. An abrasive material comprising discrete particles of an alloy which is characterized by a high impact and abrasion/resistance, such par- 25 ticles consisting of eiiective amounts and up to 5% of chromium; effective amounts and up to 5% oi nickel; etlective amounts and up to 1.0% of molybdenum; effective amounts and up to .l% of vanadium; substantially 1% of carbon, the remainder oi the alloy consisting 01' iron with small amounts of impurities, such as manganese, silicon and phosphorus. in insuflicient quantity to alter the characteristics of the alloy; the alloy being further characterized in that the vanadium content is adjusted to substantially one-fiftieth of the chromium content and the molybdenum content is adjusted to substantially one-fifth of the nickel content.

JOHN F. ERVIN. 4o 

